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Biomedical subjects

J Martin

Publications and source records attributed to J Martin.

At least 1,009 records · Page 56Linked to original sources
PubMed1980

Scanning electron microscope studies of the small intestine of rats maintained on a low protein diet and infected with Nippostrongylus brasiliensis.

In undernourished rats infected with Nippostrongylus brasiliensis partial villus atrophy was observed in large areas of the anterior and posterior regions of the intestine. In addition, the following changes in structure were observed; some areas of the intestine contained misshapen villi which lacked microvilli on the lateral surfaces; cell-like bodies devoid of microvilli appeared to be budded off from the sides and tips of some malformed villi and there appeared to be extensive leakage of blood constituents into the lumen of the intestine. Morphological changes were present up to day 24 of the infection when the experiment was terminated. The possible consequences of the extensive breakdown of villus structure are discussed.

Animals↗
PubMed1980

The structure of the intestine of Nematodirus battus and changes during the course of an infection in lambs.

The structure of the intestine of adult Nematodirus battus is described. It is similar to the intestine of some other trichostrongyles but with a few minor differences. Changes in the structure of the intestinal cells are described in N. battus taken from lambs during the later stages of an infection (days 20 to 32) with 60000 infected larvae. The most noticeable changes were a decrease in the amounts of glycogen and smooth endoplasmic reticulum, a reduction in the numbers of secretory-type granules and the appearance of vacuoles within the cells. Some of these vacuoles contained small crystals, and crystals, some of them large, were also found in the intestinal lumen. These changes, with the exception of the appearance of the crystals, are similar to changes described for Nippostrongylus brasiliensis affected by the immune response of the rat host, and it is concluded that the changes in N. battus could have been initiated by an immune response to this nematode in the lamb. Lambs given 2000 larvae of N. battus do not reject the nematodes in 32 days, and no changes were observed in the structure of these nematodes.

Animals↗
PubMed1980

Observations on the surface morphology of the ovarian balls of Moniliformis (Acanthocephala).

The surface morphology of fixed ovarian balls from female Moniliformis dubius, agd 12, 18, 26, 28, 42, 77, 105 and 118 days, has been examined by means of scanning electron microscopy. The appearance of the surface has been found to be variable between ovarian balls from worms of the same and different ages. Some parts of the surface are seen to possess micro-projections, cavities and ridges while other parts have the appearance of an irregular meshwork of fibres. Various protruding features have been observed to extend from the surfaces of the ovarian balls taken from the inseminated female worms. In most cases, the surfaces of the protruding features differ in appearance from the surrounding surfaces of the ovarian balls. Some of these features have been assumed to represent growing zygotes and developing eggs covered by the supporting syncytium of the ovarian ball. Single or several thread-like structures have been observed in association with the surfaces of ovarian balls taken from the inseminated female worms. At present, the thread-like structures are believed to be portions of spermatozoa. By means of light microscopy, preliminary observations have been made on what is considered to be the division process of ovarian balls taken from uninseminated and inseminated worms varying in age from 7 to 98 days.

Acanthocephala↗
PubMed1980

Nematodirus battus: scanning electron microscope studies of the duodenal mucosa of infected lambs.

Lambs given 60 000 third-stage larvae of Nematodirus battus were killed on days 16, 20 22, 24 and 32 of the infection and the duodenal mucosa was examined by scanning electron microscopy (SEM). On day 16 of the infection the villi were long and finger-like and, although goblet cells were visible, the surface of the villi was not extensively folded, as is the surface of villi of uninfected control animals. By day 20 of the infection the villi had been reduced to flattened, plate-like structures or had formed low, irregular-shaped ridges. On this day of the infection the nematodes appeared to be enclosed by mucus-like material. As the infection progressed the intestinal damage was repaired, so that, by day 24 of the infection, the surface of the intestine was covered by short, smooth, finger-like projections and, by day 32 of the infection, the morphology of the intestine was somewhat similar to that of the control lamb. The possible role of villus atrophy and of mucus in the rejection of N. battus from the intestine is discussed.

Animals↗
PubMed1980

Observations on the structure of the male reproductive system and spermatogenesis of Nematodirus battus.

In the male reproductive system of Nematodirus battus the spermatogonia and spermatocytes and arranged upon a central rachis and the spermatocytes are characterized by the presence of cup-shaped membranous organelles which are formed in association with Golgi complexes and granular endoplasmic reticulum. Spermatozoa of N. battus in the male nematode have a electron-dense, conical tail-like region which contains the nuclear material and an elongate cytoplasmic region which contains the cell organelles. In the uterus of the female, however, the cytoplasmic region of the spermatozoon has an amoeboid appearance and in the seminal receptacle the cytoplasmic region is dome-shaped and many of the membranous organelles have connexions with the outer membrane of the spermatozoa. Movement was not observed in spermatozoa released from the seminal vesicle of the male worm.

Animals↗
PubMed1980

Changes in the structure of the male reproductive system of Nematodirus battus during its rejection from lambs.

As the infection progresses in lambs, the developing germ cells of male Nematodirus battus become filled with lysosome-like bodies, electron-dense granules and membrane-bound vesicles, and the organization and division of the gametic nucleus appears to be altered. The epithelial cells of the reproductive tract are also damaged and the secretory-type globules produced by the cells of the vas deferens are denatured. These changes are compared with ultrastructural changes observed in other species of nematode affected by the immune response of their hosts.

Animals↗
PubMed1980

Myeloid and erythroid colony growth in non-anaemic patients with Fanconi's anaemia.

Myeloid and erythroid colony growth of the bone marrow and peripheral blood cells from one anaemic and four non-anaemic patients with Fanconi's anaemia were studied. Markedly decreased myeloid and erythroid colony growth was found in all five patients regardless of their haematological status. The decreased colony formation in non-anaemic patients with Fanconi's anaemia is thought to be due to an intrinsic cellular defect.

Adolescent↗
PubMed1980

Management of leukaemic infiltration of the testis.

Of 95 boys treated for acute lymphoblastic leukaemia 25 have developed leukaemic infiltration of the testes. In 15 children relapse was apparently confined to the testes, and since treatment 7 of these boys remain in remission. The median duration of remission after testicular relapse was 72 weeks, considerably longer than that reported after other forms of leukaemic relapse.

Adolescent↗
PubMed1980

New therapeutic approach to corrosive burns of the upper gastrointestinal tract.

The therapeutic approach to the management of corrosive burns of the upper gastrointestinal tract leaves a considerable morbidity and a heavy mortality rate. This work evaluates the effectiveness of a new therapeutic approach given to 94 consecutive patients. The management has been based on three major points: (1) the definition of extent of upper gastrointestinal lesions by immediate fibroendoscopy; (2) immediate protection of the upper gastrointestinal tract by total parenteral nutrition in cases with serious burns (41 cases), normal oral nutrition being allowed for minor burns (35 cases); (3) reparative surgical procedures for any of the sequelae of such burns during the fibrosing phase. The results were as follows: (a) healing, depending upon the degree of burn, occurred between eight to 90 days; (b) the frequency of subsequent local complications was small with total parenteral nutrition started a few hours after ingestion of the corrosive product; (c) after reconstructive surgery no serious complications occurred; (d) the overall morbidity stayed at a very low level (four patients). We conclude that the general prognosis of a severe burn of the upper gastrointestinal tract, without other trauma, is appreciably improved by the very early institution of total parenteral nutrition.

Adolescent↗
PubMed1980

The role of respiratory muscles in the hyperinflation of bronchial asthma.

To examine the mechanism of hyperinflation in bronchial asthma we studied lung and chest wall mechanics in 7 asymptomatic patients in whom progressive bronchoconstriction was induced by doubling the amount of inhaled aerosolized histamine. An increase in pulmonary resistance (RL) from 2.5 +/- 0.3 cmH2O . 1-1 . s (mean, +/- 1 SE) to 12.3 +/- 0.9 cmH2 was associated with a linear increase in functional residual capacity (FRC) up to 74.7 +/- 1.7% of control total lung capacity (TLCc). The mean regression coefficient was 2.3% TLCc . cmH2O-1 . 1 . s-1. At each level of hyperinflation the most positive expiratory pleural pressures measured during spontaneous breathing were generally less than the predicted chest wall relaxation pressures, indicating persistent inspiratory muscle contraction throughout expiration. This was predominantly due to inspiratory intercostal and accessory muscle activity, because measurements of transdiaphragmatic pressure indicated complete diaphragmatic relaxation early in expiration. Recruitment of abdominal muscles during expiration, inferred from measurements of gastric pressure (Pg) and abdominal antero-posterior (A-P) diameter, was progressively more apparent with increasing bronchoconstriction. We concluded that the increase in FRC in induced asthma is substantially influenced by persistent inspiratory intercostal and accessory muscle activity during expiration. Concomitant abdominal muscle recruitment results in a chest wall configuration that tends to optimize diaphragmatic function.

Abdomen↗
PubMed1980

[How to put real medical records into computer? Data collection per notion].

Hospitals worldwide are faced with the enormous problem of storage and easy access to large volumes of information, especially that contained in medical records forms. The utilisation of the computer has raised great hopes in this field as well as certain fears. In all the attempts to automate the medical record, one is faced with the difficult problem of its introduction into the computer. After reviewing the techniques of the medical questionnaire and the transcription record with a meta-language, we then examine the reasons we have abandoned these two techniques. Data collection per notion is the result of practice and critical examination of one and the other method, for years ago. Data collection per notion is characterized by a "bursting" of the record as soon as it is collected. Data collection per notion only is a preparation stage for the next step: on-line data collection. The introduction of medical records into computer is not an end in itself; rather it is only the first step towards the more efficient utilisation of the information contained there in.

Computers↗
PubMed1980

[Phosphorus nuclear magnetic resonance studies of the energetic state and of the intracellular pH of the isolated rat heart in the course of ischemia (author's transl)].

Continuous measurements of high energy phosphate compounds and intracellular pH in perfused, beating rat hearts, were performed by 31P nuclear magnetic resonance (NMR). Hearts were placed in a 15 mm NMR tube and perfused at 28 degrees C by conventional methods with a phosphate-free solution. Phosphorus NMR spectra were recorded at 101,3 MHz in a Brucker WP 250 spectrometer. Global mild ischemia was achieved by reducing the coronary flow to 1/10 of its initial value. Changes in creatine phosphate (CP) and inorganic phosphate (Pi) levels and intracellular pH (pHi) were monitored in the course of a 50 min ischemia and during the post-ischemic phase. When the breakdown of CP was less than 30%, the decrease in pHi was about 0.1-0.2 pH unit; for a greater CP decrease, the fall in pHi was about 1 pH unit.

Animals↗